Little Snitch is described as 'Firewall tool for monitoring, controlling, and alerting on outgoing network connections, with real-time user notifications and customizable rule-based access control' and is a very popular Firewall in the network & admin category. There are more than 25 alternatives to Little Snitch for a variety of platforms, including Windows, Mac, Android, Linux and iPhone apps. The best Little Snitch alternative is Portmaster, which is both free and Open Source. Other great apps like Little Snitch are LuLu by Objective-See, GlassWire, Fort Firewall and NetGuard.
NetGenius is a modern Internet connection monitoring, control and optimization tool. It lets you watch the apps using your Internet in real-time, control their access, and get detailed usage reports. Bandwidth-sensitive applications like voice calls, videos or games can be...
SterJo NetStalker is innovative and FREE security software able to detect all authorized and unauthorized connections to your computer and send you alert for each new connection.
Blocker is a component controller for Android applications that currently supports using PackageManager and Intent Firewall to manage the state of components. It can be seamlessly switched between these controllers, and for application rules, you can export and import them.
appNetworkCounter is a simple tool for Windows that counts and displays the number of TCP/UDP bytes and packets sent and received by every application on your system.
Armor2net personal firewall software stops hackers, data thieves, and protects your PC from Internet-borne threats. Armor2net firewall can meet your requirements for Internet security and Internet privacy.
Douane is a personal firewall that protects a user's privacy by allowing a user to control which applications can connect to the internet from their GNU/Linux computer.
With InJoy Firewall™ 4.0 you can say good-bye to old-generation Firewall solutions that were difficult to implement, manage and measure — InJoy Firewall™ is different...
Outbound firewall for apps, blocking apps from accessing internet. Useful for reducing data usage when tethering to mobile data, or on a slower wifi connection.
DataCever allows you to monitor and control internet traffic , allowing you to know what consumes your data plan.
Filseclab Personal Firewall Professional Edition is one of the most important software of Filseclab, it is very easy to use and also very powerful. It can provide more secure protection for your PC, and it is FREE.
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I like TripMode as an alternative to LittleSnitch because it's simpler UI resembles iOS and it's easy to monitor and block app internet usage. It's also significantly cheaper than LittleSnitch.